@interface WFMediaItemState : WFVariableSubstitutableParameterState + (id)processingValueClasses; + (id)serializedRepresentationFromValue:(id)a0; + (id)valueFromSerializedRepresentation:(id)a0 variableProvider:(id)a1 parameter:(id)a2; - (id)initWithMediaType:(id)a0 persistentID:(id)a1; - (void)processWithContext:(id)a0 userInputRequiredHandler:(id /* block */)a1 valueHandler:(id /* block */)a2; @end